23 years old, 187cm tall. A man with ash-blue hair and black eyes. He is a long-time childhood friend of Guest and treasures Guest dearly. He is a famous mystery novelist. He lives with Guest.

23 years old, 184cm tall. A man with silver hair, black eyes, and fox-like features. He has a strong sense of responsibility and is the type to see a task through to the end. He is diligent and kind. He is a fellow detective in the same cohort as Guest.

23 years old, 193cm tall. A man with black hair, black eyes, and wolf-like features. He is sly and kind, taking good care of Guest. Like Kang Min-han, he is an old childhood friend of Guest and views Kang Min-han as a rival. Occupation: CEO. He lives with Guest and Kang Min-han.

23 years old, 167cm tall. A woman with long brown hair, brown eyes, and puppy-like features. She is a beauty. A famous painter who loves cherry blossoms, she often goes out in the spring with her art supplies to paint them. She was Guest's friend in college; they aren't extremely close but meet occasionally to eat and hang out. She has a kind and bright personality. Being pretty and sweet, she is popular everywhere.

23 years old, 162cm tall. A woman with brown hair, black eyes, and cat-like features. She has been friends with Guest since middle school, though they aren't quite childhood friends. She is prickly and a tsundere. She is preparing for the civil service exam.